[1] http://www.imdb.com/title/tt0091042/trivia [2] http://www.glenbrook225.org/north/calendars/Documents/2010_2...
http://www.cps.edu/Calendar/Key_events/Pages/KeyEvents.aspx
I tried finding their 1985 calendar in Google's cache, but can't seem to find it :)
According to yahoo answers, of all places, the rule has been in place since 1909. http://answers.yahoo.com/question/index?qid=20080723181123AA...
Amazing game, wish I remembered it